Excitation of high n toroidicity-induced Alfvén eigenmodes and associated plasma dynamical behaviour in the JT-60U ICRF experiments

H. Kimura, M. Saigusa, S. Moriyama, T. Kondoh, Y. Neyatani, T. Ozeki, T. Nishitani, Y. Kusama, T. Fujii, M. Sato, M. Memoto, K. Tobita, C. Z. Cheng

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

High frequency MHD activities observed during second harmonic ICRF heating are identified to be toroidicity-induced Alfvén eigenmodes (TAE) driven by MeV protons produced by ICRF heating. Correlation between MeV protons and TAE modes is clearly observed. TAE mode amplitude increases exponentially with increasing toroidal mode number up to more than ten. The tendency cannot be explained by present local TAE stability theories. Long suppression of TAE modes after a giant sawtooth crash can be explained by fast ion loss due to the sawtooth crash and evolving q-profile.

Original languageEnglish
Pages (from-to)86-92
Number of pages7
JournalPhysics Letters A
Volume199
Issue number1-2
DOIs
Publication statusPublished - 1995 Mar 20
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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